What scene does John Keats describe in “Ode on a Grecian Urn”?

In his famous poem "Ode on a Grecian Urn," John Keats describes a pastoral scene depicted on an ancient vessel. The imagery features two lovers engaged in a chase within a rural setting.1

Keats uses this scene to explore the philosophical contrast between the fleeting nature of human life and the permanence of art. While the figures on the urn are frozen in a state of eternal passion, the poet notes that they are forever unable to consummate their love—a sacrifice required for their immortality. This reflection highlights the inherent mutability of human existence, where love can be fulfilled but is ultimately subject to loss, unlike the static, unchanging beauty captured by the artist.1